You work hard to promote your blog and you get good traffic and good revenue. But what if your server goes down for one hour where your blog is hosted? You will lose many of your visitors referred by search engines. And perhaps they will not come again to see you. And this all will happen without your awareness. If your website down time is longer and it recurs regularly then you may make your mind to change your hosting provider.

But how you will know your site was down for some hours yesterday? There are some of online tools that monitors website downtime and uptime for free. If you have planned to buy a premium service for web monitoring it will cost you more than shared hosting. In this list all the sites are with free and premium services.

These sites does not monitor only website but also web server, email server etc and support multi protocols.